Missing variable calculation in addition equation fun games for children in third grade, fourth grade and fifth grade. This quiz for involves an equation that involves an addition sign and contains an unknown variable. The students are required to balance both sides of the equation in order to find missing variable e.g 8+X= 13. It could also involve taking the variable across the equality sign. The latter leads to a sign change, as addition sign becomes a subtraction sign after crossing. This quiz is suitable for students of the 3rd, 4th, 5th and 6th grade. It can be used in schools by teachers and also tutors and parents at home.

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